The Magura 6.1 Performance dics pads fit 2009 Magura Marta SL, Marta SL Mag Ti, 07+ Louise, Louise BAT, and 09 Julie disc brakes. The Performance pad compound provides quieter and grabbier braking than the Endurance. However, they typically have a shorter lifer span that the Endurance model when used primarily in wet conditions. The pad itself is designed to tell the user when to replace them. Namely, if the wear indicator starts clicking when the brake is applied, it's time to replace. The price is for two pads, enough to do one wheel.